Liquid crystal display apparatus

Abstract

Disclosed herein is a liquid crystal display apparatus, including: a liquid crystal panel having a pixel region in which first and second electrodes apply an electric field to a liquid crystal layer to display an image; the liquid crystal panel including a photo-sensor element having a light receiving face at which the photo-sensor element receives incident light through the liquid crystal layer in the pixel region to produce received light data; at least one of the first and second electrodes being formed in a region of the pixel region other than a light receiving face corresponding region of the pixel region which corresponds to the light receiving face of the photo-sensor element.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]This invention relates to a liquid crystal display apparatus, and more particularly to a liquid crystal display apparatus wherein a photo-sensor element is provided in a pixel region of a liquid crystal panel and receives, at a light receiving face thereof, light incident thereto through a liquid crystal layer to produce received light data.[0003]2. Description of the Related Art[0004]A liquid crystal display apparatus includes, as a display panel, a liquid crystal panel wherein a liquid crystal layer is enclosed between a pair of substrates. The liquid crystal panel is formed, for example, as a transmission type liquid crystal panel which modulates and transmits therethrough illuminating light emitted from an illuminating apparatus such as a backlight provided on the rear face of the liquid crystal panel. An image is formed from the modulated illuminating light on the front face of the liquid crystal panel.[0005]The li...

AI Technical Summary

Benefits of technology

"The present invention provides a liquid crystal display apparatus that can improve the signal-to-noise ratio of received light data obtained from a photo-sensor element. The technical effect of the invention is to improve the accuracy of detecting the position of a detection object body using the received light data. This is achieved by forming at least one of the electrodes in a region of the pixel region that is not in the proximity of the photo-sensor element, which reduces the noise in the received light data. Additionally, the invention includes a filter layer that transmits invisible rays to improve the accuracy of detecting the position of the detection object body. The invention also includes an illuminating section that emits visible and invisible rays to improve the accuracy of detecting the position of the detection object body."

Problems solved by technology

However, it is sometimes difficult to obtain data of a sufficiently high S / N (signal to noise) ratio because received light data obtained by the photo-sensor element includes noise.

For example, where coupling occurs between electrodes which apply an electric field to the liquid crystal layer and the photo-sensor element, much noise is sometimes included in the received light data, resulting in a drop of the S / N ratio.

Consequently, it is sometimes difficult to precisely detect the position of the detection object body.

Therefore, since the common electrode is provided in the proximity of the photo-sensor element, coupling is likely to occur between the common electrode and the photo-sensor element, which gives rise to such a fault as described above.

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